Mailing addresses for Forms 941 ; Department of the Treasury Internal Revenue Service Kansas City, MO 64999-0005. Internal Revenue Service PO Box 806532As a business owner (SCorp) I pay monthly tax deposits towards quarterly tax return, form 941. I accidentally overpaid deposit for May 2017. Action steps and links to follow for a taxpayer who wants to request a refund from the Cuyahoga County Treasurer's Department. Tax Forms ; 2023 Net Profit Instruction Booklet, download printable form ; 2023 Net Profit Tax Return, download printable form. This guide provides the basics of the 941 form, instructions to help you fill it out, and where you can get help meeting all your payroll tax obligations.